package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到redis //set key value ex 120
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY + phone, code, RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送验证码成功，验证码：{}", code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //3.从redis中获取验证码并校验
        String cacheCodeKey = RedisConstants.LOGIN_CODE_KEY + phone;
        String cacheCode = stringRedisTemplate.opsForValue().get(cacheCodeKey);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //验证码正确后删除验证码
        stringRedisTemplate.delete(cacheCodeKey);
        //4.一致，根据手机号查询用户 select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if (user == null) {
            //6.用户不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
        //7.保存用户信息到redis中
        //7.1 随机生成token，作为登陆令牌
        String token = UUID.randomUUID().toString(Boolean.TRUE);
        //7.2 将user对象转为HashMap
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,
                new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        //7.3 存储
        String redisKey = RedisConstants.LOGIN_TOKEN_KEY + token;
        stringRedisTemplate.opsForHash().putAll(redisKey, userMap);
        //7.4 设置token有效时间
        stringRedisTemplate.expire(redisKey, RedisConstants.LOGIN_TOKEN_TTL, TimeUnit.MINUTES);
        //8 返回token
        return Result.ok(token);
    }

    /**
     * 根据手机号创建新用户
     *
     * @param phone 手机号
     * @return 新用户对象
     */
    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomNumbers(10));
        //2.保存用户到数据库
        this.save(user);
        return user;
    }

    /**
     * 内部自己用的
     *
     * @param phone
     * @return
     */
//    @Override
//    public String sendCode(String phone) {
//        //1.校验手机号
////        if (RegexUtils.isPhoneInvalid(phone)) {
////            //2.如果不符合，返回错误信息
////            return Result.fail("手机号格式错误！");
////        }
//        //3.符合，生成验证码
//        String code = RandomUtil.randomNumbers(6);
//        //4.保存验证码到redis //set key value ex 120
//        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY + phone, code, RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);
//        //5.发送验证码
//        log.debug("发送验证码成功，验证码：{}", code);
//        //返回ok
//        return code;
//    }

    /**
     * 内部自己用的
     *
     * @param user
     * @return
     */
    @Override
    public String login(User user) {
//        String phone = user.getPhone();
//        //1.校验手机号
//        if (RegexUtils.isPhoneInvalid(phone)) {
//            //2.如果不符合，返回错误信息
//            log.error("手机号格式错误: {}", phone);
//        }
        //3.从redis中获取验证码并校验
//        String cacheCodeKey = RedisConstants.LOGIN_CODE_KEY + phone;
//        String cacheCode = stringRedisTemplate.opsForValue().get(cacheCodeKey);
//        String code = loginForm.getCode();
//        if (cacheCode == null || !cacheCode.equals(code)) {
//            //3.不一致，报错
//            log.error("验证码错误!!");
//        }
//        //验证码正确后删除验证码
//        stringRedisTemplate.delete(cacheCodeKey);
        //4.一致，根据手机号查询用户 select * from tb_user where phone = ?
//        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
//        if (user == null) {
//            //6.用户不存在，创建新用户并保存
//            user = createUserWithPhone(phone);
//        }
        //7.保存用户信息到redis中
        //7.1 随机生成token，作为登陆令牌
        String token = UUID.randomUUID().toString(Boolean.TRUE);
        //7.2 将user对象转为HashMap
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,
                new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        //7.3 存储
        String redisKey = RedisConstants.LOGIN_TOKEN_KEY + token;
        stringRedisTemplate.opsForHash().putAll(redisKey, userMap);
        //7.4 设置token有效时间
        stringRedisTemplate.expire(redisKey, 120L, TimeUnit.MINUTES);
        //8 返回token
        return token;
    }

    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDate now = LocalDate.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是当月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDate now = LocalDate.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是当月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截止今天位置的所有签到记录，返回的是一个十进制的数字
        //BITFIELD sign:1011:202205 get u14 0
        List<Long> resultList = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (CollectionUtil.isEmpty(resultList)) {
            //没有任何结果
            return Result.ok(0);
        }
        Long num = resultList.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        //6.循环遍历
        int count = 0;
        while (true) {
            //6.1 让这个数字与1做与运算，得到数字的最后一个bit位 //判断这个bit位是否为0
            if ((num & 1) == 0) {
                //6.2 如果为0，说明未签到，结束
                break;
            } else {
                //6.3 如果不为0，说明已签到，计数器+1
                count++;
            }
            //6.4 把数字右移一位，抛弃最后一个bit位，
            num >>>= 1;
        }
        return Result.ok(count);
    }

    @Override
    public Result signCountDetail() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDate now = LocalDate.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是当月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //定义返回结果字符串
        StringBuilder result = new StringBuilder();
        for (int i = 0; i < dayOfMonth; i++) {
            Boolean signed = stringRedisTemplate.opsForValue().getBit(key, i);
            result.append(BooleanUtil.isTrue(signed) ? "1" : "0");
        }
        return Result.ok(result.toString());
    }
}
